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Old 05-25-2009, 07:23 AM   #1
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constant trickle into sump


I have lived in this house for the past 3 years and this last year started noticing that the sump pump kicks on 2-3 times/hour every day (even when it hasn't rained for days..also in the cold Chicago winter). There is also water on the street where the water comes out of the sump pump hose.

In the basement there is always the sound of a slow trickle of water into the sump. I am wondering if there is a cracked pipe or something like that. Looking for recommendations on what to look at/who to even call to look at this to better understand what is going on.

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Old 05-26-2009, 06:26 AM   #2
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constant trickle into sump


First question: are you sure the sump pump was cycling less frequently at some point in the past, or is possible that you just noticed the increased cycling?

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If you have a leak in the supply plumbing, and the sump pump is running several times a day, that would mean it is leaking at least several cubic feet of water per day close to the foundation drain tile system.

If you have a water meter (not all homes in Chicago do), and the leak is on your side of the meter, you can use the meter readings to check for the possibility of a leak - the next time you will be out for the day make sure nothing (including ice makers, etc.) will be consuming water, note the meters exact reading, and see if it is increased when you return.

If the leak is on the city side of the meter (for example because of foundation settling which has damaged the water line where it passes through the foundation wall) it's a lot tougher to diagnose, ultimately you might have to turn off the water at the curb box in dry weather and wait to see if water flow into the sump is slowed.

However also consider other possible reasons for constant flow into the sump.

For example, is the pump discharge sufficiently far from the structure so that it's discharge cannot reenter the foundation:



Fig 1

This is a pretty dramatic example, but the principle is the same for lower flows. (This pump was in Chicago, BTW, and also illustrates that you can get substantial amounts of groundwater at the foundation drain system even in freezing weather in our Chicago climate).


How about your neighbors sump pump discharge - for instance I sometimes find these peeking out from under the fence of adjacent properties.

Also, where are gutters and downspouts currently discharging?

It these are discharging into areas where water can return to the foundation drain system the ground can store large amounts of water which gradually seeps back into the foundation drain system - this can cause cycling of a sump pump even after weeks of "dry" weather.

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Last edited by Michael Thomas; 05-26-2009 at 06:30 AM.
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Old 05-26-2009, 07:18 AM   #3
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constant trickle into sump


Hint for those eavesdropping: Ideally there should not be water ponding against the house or near the house at any time for any reason (example pictured above).
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